You can't try before you buy.

According to GameReactor, Titanfall 2 will not be part of EA Access or Origin Access, meaning there won't be any free trials or early access to the game, nor will there be any discounts when it launches.

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This report is backed up by the fact it says Titanfall 2 is excluded from EA Access in the fine print of the FAQ section of the official website. Respawn told GameReactor it might get included in the future, but not this year.